{"id":2227591,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2227591/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/patch/20260424-ds90ub953-v6-2-7a84efbab316@oss.nxp.com/","project":{"id":42,"url":"http://patchwork.ozlabs.org/api/1.1/projects/42/?format=json","name":"Linux GPIO development","link_name":"linux-gpio","list_id":"linux-gpio.vger.kernel.org","list_email":"linux-gpio@vger.kernel.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260424-ds90ub953-v6-2-7a84efbab316@oss.nxp.com>","date":"2026-04-24T01:42:25","name":"[v6,2/4] media: i2c: ds90ub953: Add back channel GPIO support","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"83a5e08373a352a61b49bf98c8f967791b799d3b","submitter":{"id":86694,"url":"http://patchwork.ozlabs.org/api/1.1/people/86694/?format=json","name":"Guoniu Zhou","email":"guoniu.zhou@oss.nxp.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-gpio/patch/20260424-ds90ub953-v6-2-7a84efbab316@oss.nxp.com/mbox/","series":[{"id":501274,"url":"http://patchwork.ozlabs.org/api/1.1/series/501274/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/list/?series=501274","date":"2026-04-24T01:42:23","name":"media: i2c: ds90ub953: Add back channel GPIO support","version":6,"mbox":"http://patchwork.ozlabs.org/series/501274/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227591/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227591/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com\n 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dkim=pass header.d=oss.nxp.com; arc=none"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=NXP1.onmicrosoft.com;\n s=selector1-NXP1-onmicrosoft-com;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=62f+Qx0wlmDEkQvxsskjpFYSF7HYxHmyfReCsejF4Rc=;\n b=xdVtIpRnCQmD7yJdbk+L+nq7eENdHD7FQbZvQBYpRNliNPod0y77f4vFUt4ZoeN4zTLs4H48kGdXg+0YTno3AulAvT1GAarDyHGzB5+MBxY4YIQYKTnYX3Ro/kBnmnVzugUOLLQpSxPA0HrG4nfIlVKVGkUpy/5lt1B/eKkU7N4mlVypJLI5R4bRznvxBkJDOoWjS2jrnctGSpQt2Jwrp6AuIck+8VI/gLXrYWXJAHDibk00MMVneflcFYZnpt8PPw8DZQ5AlAM16E7wutIgRcfYrrp274qvQWdqRvYag5TqEp06rlpXzYKtKvwxKY8nRZ7pt76oft1vwMznypqncw==","From":"Guoniu Zhou ","Date":"Fri, 24 Apr 2026 09:42:25 +0800","Subject":"[PATCH v6 2/4] media: i2c: ds90ub953: Add back channel GPIO\n support","Content-Type":"text/plain; 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bab77a13-dd2c-46d9-e6e0-08dea1a267d2","X-MS-Exchange-CrossTenant-AuthSource":"AS8PR04MB9080.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"24 Apr 2026 01:40:03.3080\n (UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"686ea1d3-bc2b-4c6f-a92c-d99c5c301635","X-MS-Exchange-CrossTenant-MailboxType":"HOSTED","X-MS-Exchange-CrossTenant-UserPrincipalName":"\n MmIhQoQ4WuKgMIk4JK4Cwm4T6A3rLYlZOLdWp43aiEQ7KI/Sq+bX8veuy6f2F0t9yBsDfjwiDOHenlyJJtw4jg==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"VE1PR04MB7455"},"content":"From: Guoniu Zhou \n\nThe ds90ub953 supports GPIO0 through GPIO3. When enabled as an output,\neach GPIO pin can be programed to output remote data coming from the\ncompatible deserializer using the register LOCAL_GPIO_DATA[7:4] field.\n\nAdd back channel GPIO support by parsing flags from device tree.\n\nSigned-off-by: Guoniu Zhou \n---\nChanges in v6:\n- Changed approach from extending GPIO range (v5) to using a custom GPIO\n flag (GPIO_DATA_SOURCE_REMOTE) as suggested by the driver maintainer\n\nChanges in v4:\n- Only log GPIO 0-3 stats since remote GPIO 4-7 reuse GPIO 0-3 pins.\n\nChanges in v3:\n- Update driver to expand GPIO range.\n\nChanges in v2:\n- Parse gpio third cell to select which GPIO pin the data from remote\n compatible deserializer.\n---\n drivers/media/i2c/ds90ub953.c | 51 ++++++++++++++++++++++++++++++++++++++-----\n 1 file changed, 45 insertions(+), 6 deletions(-)","diff":"diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c\nindex a8ab67f4137f..da63dcfbbbc3 100644\n--- a/drivers/media/i2c/ds90ub953.c\n+++ b/drivers/media/i2c/ds90ub953.c\n@@ -27,6 +27,8 @@\n #include \n #include \n \n+#include \n+\n #include \"ds90ub953.h\"\n \n #define UB953_PAD_SINK\t\t\t0\n@@ -71,6 +73,7 @@ struct ub953_data {\n \tbool\t\t\tnon_continous_clk;\n \n \tstruct gpio_chip\tgpio_chip;\n+\tu32\t\t\tgpio_flags[UB953_NUM_GPIOS];\n \n \tstruct v4l2_subdev\tsd;\n \tstruct media_pad\tpads[2];\n@@ -258,6 +261,12 @@ static int ub953_write_ind(struct ub953_data *priv, u8 block, u8 reg, u8 val,\n /*\n * GPIO chip\n */\n+\n+static inline bool ub953_gpio_is_remote(unsigned int flag)\n+{\n+\treturn !!(flag & GPIO_DATA_SOURCE_REMOTE);\n+}\n+\n static int ub953_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)\n {\n \tstruct ub953_data *priv = gpiochip_get_data(gc);\n@@ -288,13 +297,23 @@ static int ub953_gpio_direction_out(struct gpio_chip *gc, unsigned int offset,\n \t\t\t\t int value)\n {\n \tstruct ub953_data *priv = gpiochip_get_data(gc);\n+\tbool is_remote = ub953_gpio_is_remote(priv->gpio_flags[offset]);\n+\tunsigned int mask, val;\n \tint ret;\n \n-\tret = regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA,\n-\t\t\t\t UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),\n-\t\t\t\t value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) :\n-\t\t\t\t\t 0);\n+\tmask = UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) |\n+\t UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(offset);\n \n+\tif (is_remote) {\n+\t\t/* Enable remote deserializer GPIO data on local GPIO */\n+\t\tval = UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(offset);\n+\t} else {\n+\t\t/* Set output value on local GPIO and disable remote mode */\n+\t\tval = value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) : 0;\n+\t}\n+\n+\tret = regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA,\n+\t\t\t\t mask, val);\n \tif (ret)\n \t\treturn ret;\n \n@@ -330,10 +349,30 @@ static int ub953_gpio_of_xlate(struct gpio_chip *gc,\n \t\t\t const struct of_phandle_args *gpiospec,\n \t\t\t u32 *flags)\n {\n+\tstruct ub953_data *priv = gpiochip_get_data(gc);\n+\tstruct device *dev = &priv->client->dev;\n+\tu32 pin;\n+\n+\tif (WARN_ON(gc->of_gpio_n_cells < 2))\n+\t\treturn -EINVAL;\n+\n+\tif (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))\n+\t\treturn -EINVAL;\n+\n+\tpin = gpiospec->args[0];\n+\tif (pin >= UB953_NUM_GPIOS) {\n+\t\tdev_err(dev, \"Invalid GPIO pin number: %u\\n\", pin);\n+\t\treturn -EINVAL;\n+\t}\n+\n+\t/* Store GPIO flags for each pin */\n+\tpriv->gpio_flags[pin] = gpiospec->args[1];\n+\n+\t/* Return standard flags to GPIO core */\n \tif (flags)\n-\t\t*flags = gpiospec->args[1];\n+\t\t*flags = gpiospec->args[1] & ~GPIO_DATA_SOURCE_REMOTE;\n \n-\treturn gpiospec->args[0];\n+\treturn pin;\n }\n \n static int ub953_gpiochip_probe(struct ub953_data *priv)\n","prefixes":["v6","2/4"]}